Means for attaching laminated sheet-metal rings



June 17, 1930. w. RRRRR EL 1,764,890

& Mm Wm M Patented June 17, 1930 UNITED STATES PATENT OFFICE WALTER REICHEL, OF BERLIN-LANKWI'I'Z, GERMANY, ASSIGNOR TO SIEMENS-SCI-IUCK- ERTWERKE AK'I'IENGESELLSCHAFT, 0F BERLIN-SIEMENSSTADT, GERMANY, A COR- PORATION OF GERMANY MEANS FOR ATTACHING LAMINATED SHEET-METAL RINGS Application filed June 25, 1928, Serial No. 288,178, and in Germany July 6, 1927.

I have filed corresponding applications in Germany on July 6, 1927; in Austria on April 20, 1928; in Switzerland on June 14, 1928; in England on June 26, 1928; in Italy on June 27 1928; in Norway on June 30, 1928; and in Japan on July 5, 1928.

My invention relates to a ring formed of sheet iron sections placed end to end and fastened to a carrier member. Such compound bodies are employed in electrical machines and apparatus. Hitherto it was customary to connect the individual sections composingthe ring rigidly with their supporting member. This has the disadvantage, that when the iron sections of the ring become heated heat strains are set up in them, because the sections have the tendency to expand, but are prevented from doing so by the rigid connection with their carrier or support.

According to my invention this drawback is eliminated by having only the fastening means, which connect the iron punchings with their carrier member, rigidly connected with the said member, while the punchings are free to movein a radial direction in relation to the fastening means. Heat strains can then no longer develop in the punchings, as they are able to expand towardsthe outside with a slight increase in diameter owing to the radial play provided.

An embodiment of my invention, by way of example, is illustrated in the drawings affixed hereto and forming part of my specification.

In these drawings:

Fig. 1 represents a portion of a sheet iron ring and its carrier member suitable for the stator of an electrical machine, and

Fig. 2 represents a section in the direction of the ringp-lane through a point of attachment of the punchings on the carrier member, on an enlarged scale.

Like numerals of reference indicate like parts in both figures of the drawing.

Referring to the drawings, it will be seen that on the inner periphery of the stator shell 1 are mounted spaced transverse bars or keys 2 by means of screws 3. On these keys are placed the individual sheet iron sections or punchings 4 with radial play. The crosssection of the keys is preferably rectangular with the sides near the base inwardly bevelled as shown at 6. The straight side portions 5 take up the thrust of the punchings in circum ferential direction and prevent displacement of the laminated ring in that direction. On

the other hand the punchings are able to move in a radial direction in relation to the keys, so that they can expand freely when heated.

Various modifications and changes may be made without departing from the spirit and the scope of the invention, and I desire, therefore, that only such limitations shall be placed thereon as are imposed by the prior art.

I claim as my invention:

1. In combination an annular carrier element, a laminated ring element disposed within said carrier element and being radially spaced a suitable distance from the inner periphery of said carrier element, and a plurality of keys fixed to one of said elements, the other element having a correspondingly disposed number of slots dimensioned with relation to said keys to fix said ring element with respect to said carrier element in circumferential direction, each of said slots having a greater depth than'required to accommodate a key, whereby said ring is permitted to freely expand in radial direction.

2. In combination an annular carrier, a laminated ring disposed within said carrier and being radially spaced a suitable distance from the inner carrier periphery, and a plurality of keys extending axially to the inner carrier periphery and being spaced apart on and fixed to the inner carrier periphery, the portion of the key sides near their base being inwardly bevelled, said ring having transverse slots on its outer periphery spaced similarly to said keys and being shaped in accordance with the contour of said keys, but having greater depth than required to accommodate a key, whereby said ring is permitted to freely expand in radial direction, but is prevented from moving circumferentially with relation to said carrier.

In testimony whereof I affix my signature.

WVALTER REICHEL. 

